Soma Buena Vista Mixte

[Susan]

Well, her hubby is insisting that even the XS is too big for her. I want to say she is 5'0" ish. She wants to be able to step through easily but also wants a lighter frame (she has a comfort bike now that has the loop-type step through and that sucker is HEAVY). I've encouraged them to contact Soma and ask how high the mixte bar is (they don't publish it on their website--they pubish a 25" standover but I really doubt that's to the mixte tube...seems high to me).

I have the S frame (not the smallest one that would use 26'' wheels) and I am 5'3''. The XS frame is quite a lot smaller.
It's possible to step through the Soma frame when wearing a skirt, but I wouldn't consider it a real "step through" frame like the one you described. I own a comfort bike too and there's quite a difference between the step-trough height of that one and the Soma. While I always jump down the comfort bike by putting my foot through the frame while the bike is still rolling, I can't do this on the Soma where I rather get on and of the bike the traditional way over the saddle.
The Soma feels very small and comfortable, but is a lot more stretched out than the comfort bike. If you don't shorten the fork though, you can achieve a more upright position that comes close to that on a comfort bike.